<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex===index}"
        @click="selectMenu(index,$event)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="food in item.foods" class="food-item border-1px">
              <div class="icon">
                <img width="57" height="57" :src="food.icon" >
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span>月售{{food.sellCount}}份</span>
                  <span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span>
                  <span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart ref="shopcart" :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
  </div>
</template>

<script>
  import BScroll from 'better-scroll';
  import shopcart from '../shopcart/shopcart';
  import cartcontrol from '../cartcontrol/cartcontrol'

  const ERR_OK = 0;

    export default {
      props: {
        seller: {
          type: Object
        }
      },
      data() {
        return {
          goods: [],
          listHeight: [],
          scrollY: 0
        };
      },
      computed: {
        currentIndex() {
          for(let i = 0; i<this.listHeight.length; i++){
            let height1 = this.listHeight[i];
            let height2 = this.listHeight[i + 1];
            if(!height2 || (this.scrollY >= height1 && this.scrollY < height2)){
              return i;
            }
          }
          return 0;
        },
        selectFoods() {
          let foods = [];
          this.goods.forEach((good) => {
            good.foods.forEach((food) => {
              if(food.count) {
                foods.push(food);
              }
            });
          });
          return foods;
        }
      },
      created() {
        this.classMap = ['decrease','discount','special','invoice','guarantee'];

        this.$http.get('/api/goods').then((response) => {
          response = response.body;
          if (response.errno === ERR_OK){
            this.goods = response.data;
            this.$nextTick(() => {
              this._initScroll();
              this._calculateHeight();
            });

          }
        });
      },
      methods: {
        selectMenu(index,event) {
          if (!event._constructed) {
            return;
          }
          let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
          let el = foodList[index];
          this.foodsScroll.scrollToElement(el, 300);

        },
        _drop(target) {
          // 体验优化,异步执行下落动画
          this.$nextTick(() => {
            this.$refs.shopcart.drop(target);
          });
        },
        _initScroll() {
          this.menuScroll = new BScroll(this.$refs.menuWrapper, {
            click: true
          });

          this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
            click: true,
            probeType: 3
          });

          this.foodsScroll.on('scroll', (pos) => {
            this.scrollY = Math.abs(Math.round(pos.y));
          });
        },
        _calculateHeight() {
          let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
          let height = 0;
          this.listHeight.push(height);
          for (let i = 0; i < foodList.length; i++){
            let item = foodList[i];
            height += item.clientHeight;
            this.listHeight.push(height);
          }
        }
      },
      components: {
        shopcart,
        cartcontrol
      },

    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"

  .goods
    display: flex
    position: absolute
    top: 174px
    bottom: 46px
    width: 100%
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 56px
        padding: 0 12px
        line-height: 14px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          border-1px(rgba(7,17,27,0.1))
          font-size: 12px
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .food-item
        display: flex
        margin: 18px
        padding-bottom: 18px
        border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 12px
            font-size: 10px
            color: rgb(147, 153, 159)
          .desc
            line-height: 12px
            margin-bottom: 8px
          .extra
            .count
              margin-right: 12px
          .price
            font-weight: 700
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px
</style>
